Dbowlman

Hi from West Tennessee.... I have recently acquired an Adler 30-7 in good condition, mounted on an Adler stand with most of the treadle parts missing.  I mounted a 1/2 hp servo motor and rigged a foot control to what's left of the treadle assembly.  The machine head was complete and it sewed OK when I got it.  I noticed after a few days that the little tension spring on the bobbin case/hook was missing.  After some head scratching, I discovered the spring and screw on an extra bobbin hook from my Singer 29-4 small bobbin machine would fit and work.  So, it sews fine.  I've been told by Bob at Toledo Sewing Machines, that the Bobbin/hook assembly from a large bobbin Singer patcher would work in this Adler.  I bought one as a backup... it looks almost the same as the Adler part, but it doesn't work.  Any thoughts? Am I missing something?